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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
4051 in reverse
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CHRISKELLY



Joined: Apr 08, 2018
Posts: 13
Location: England

PostPosted: Tue May 01, 2018 6:12 am    Post subject: 4051 in reverse Reply with quote  Mark this post and the followings unread

Picked up some 4051 chips to use, and thought that i could send 1 of 10 inputs in to get a binary out. The plan was to use a 4017 to cycle through 1 to 10, so that the binary outs could switch on/off three tones to create a little melody.

Didnt seem to work so i'm guessing that it works by binary input with 1 to 10 outputs Crying or Very sad

Is this true or can it be used either way?
If not, is there another chip that will do this for me?

Chris
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Steveg



Joined: Apr 23, 2015
Posts: 81
Location: Perth, Australia

PostPosted: Tue May 01, 2018 6:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Chris,

The 4051 is a bi-directional analog switcher. So it should work like you want although it is 8:1 not 10:1. Not sure how you would drive the addresses from a 4017. I suspect that isn't working like you might have thought. You need 3 digital inputs for the a, b & c address selectors. You can use three oscillators or three outputs of a counter or a shift register.

Steve
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PHOBoS



Joined: Jan 14, 2010
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PostPosted: Tue May 01, 2018 7:36 am    Post subject: Reply with quote  Mark this post and the followings unread

If I understand correctly what you are trying to achive you might be looking for a priority encoder like the CD4532.
However using a 4017 + 4532 to get a binary count seems a bit silly as you can just use an binary counter instead.
But with the 2 chips you can easily mix up the order so maybe that's what you want.

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CHRISKELLY



Joined: Apr 08, 2018
Posts: 13
Location: England

PostPosted: Tue May 01, 2018 7:51 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks guys

Sorry Steve i meant 8 inputs not 10!

What i was hoping for was to cycle 3 notes in binary:
A, B and C

First step - C (0 0 1)
2nd - B (0 1 0)
3rd - B + C (0 1 1)
4th - A (1 0 0)
5th - A + C (1 0 1)
etc
If that makes sense?
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PHOBoS



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PostPosted: Tue May 01, 2018 9:05 am    Post subject: Reply with quote  Mark this post and the followings unread

how are the notes produced ? as you could use any binary counter for that sequence (CD4040, CD4060, CD4029, CD4520 and there are more).
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CHRISKELLY



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Posts: 13
Location: England

PostPosted: Tue May 01, 2018 9:30 am    Post subject: Reply with quote  Mark this post and the followings unread

Ahh yes of course a 4040 would work! Thanks for the suggestions Very Happy

I've got an APC to create a tone, then made the 3rd and 5th of that same tone produced using 4046 PLL's. They feed into the inputs of a 4066 and i was thinking of ways fo switch them on and off in a more interesting way.
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